
Ah, Mary Sues often have anti-hero traits these days, with "flaws" such as "gets angry easily" or "anti-authoritarian rebel" or "very protective of friends" or "an angsty loner". And for male Sues especially, it seems like you have to give your character a lot of those. What makes them Sues is that those flaws never kick them in the ass - they're just there to showcase how cool the character is. The character is still always the best and always right, but in an edgy way, not a wholesome and bright way.